Phase 2 build initial

sdks/rust/Cargo.toml

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+[package]
+name = "hcfs-sdk"
+version = "2.0.0"
+edition = "2021"
+description = "Rust SDK for the Context-Aware Hierarchical Context File System"
+license = "MIT"
+repository = "https://github.com/hcfs/hcfs"
+homepage = "https://docs.hcfs.dev/sdk/rust"
+documentation = "https://docs.rs/hcfs-sdk"
+keywords = ["hcfs", "context", "ai", "search", "embeddings"]
+categories = ["api-bindings", "web-programming::http-client"]
+authors = ["HCFS Development Team <dev@hcfs.dev>"]
+readme = "README.md"
+rust-version = "1.70"
+
+[dependencies]
+# HTTP client
+reqwest = { version = "0.11", features = ["json", "rustls-tls"], default-features = false }
+
+# Async runtime
+tokio = { version = "1.0", features = ["full"] }
+
+# Serialization
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
+# Error handling
+thiserror = "1.0"
+anyhow = "1.0"
+
+# Time handling
+chrono = { version = "0.4", features = ["serde"] }
+
+# WebSocket support
+tokio-tungstenite = { version = "0.20", optional = true, features = ["rustls-tls-webpki-roots"] }
+futures-util = { version = "0.3", optional = true }
+
+# Caching
+moka = { version = "0.12", features = ["future"], optional = true }
+
+# Retry logic
+backoff = { version = "0.4", optional = true }
+
+# Rate limiting
+governor = { version = "0.6", optional = true }
+
+# Metrics
+prometheus = { version = "0.13", optional = true }
+
+# Tracing
+tracing = { version = "0.1", optional = true }
+
+# URL handling
+url = "2.4"
+
+# UUID for request IDs
+uuid = { version = "1.0", features = ["v4"] }
+
+[dev-dependencies]
+tokio-test = "0.4"
+wiremock = "0.5"
+
+[features]
+default = ["cache", "retry", "rate-limit"]
+websocket = ["tokio-tungstenite", "futures-util"]
+cache = ["moka"]
+retry = ["backoff"]
+rate-limit = ["governor"]
+metrics = ["prometheus"]
+tracing = ["dep:tracing"]
+full = ["websocket", "cache", "retry", "rate-limit", "metrics", "tracing"]
+
+[[example]]
+name = "basic_usage"
+required-features = ["cache"]
+
+[[example]]
+name = "websocket_streaming"
+required-features = ["websocket"]
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]